Means fob con voting rotary into reciprocating motion



W. B BALDWIN AND J. CURTIN.- MEANS FOR CONVERTING ROTARY INTO RECIPROCATING MOTION.

APPLICATION F- I.L,EDJUNE 22, 1913. mmmq.

' 5] to 5' MB. Ba/t/wizz Z El i tow 0,13

Patented June 24, 1919.

2 SHEETSSHEET- I.

D U l VII MEANS FOR CONVERHNG ROTARY INTO RECIPROCATING MOTION.

ALP-MN ANDJ. CURTiN APPLICATlON FILED JUNE 22.19I8.

2 SHEETSSHEET'2.

struction,

' provide rocating engine UNITED stares PA OFFICE; A A

WILLIAM B. BALDWIN AND JOHN ounrm, or so rH MADISON, wrsconsm,

MEANS ron'oonvnmme Roman m ro nncrraocarrno morron.

To all whom-it'may concern:

Be it known that we, WIL I M B; BALD.- WIN and J onN CURTIN citizens of the United States, residinga South'Madison, in the county of Dane and State of Wisconsin, have invented Eeitain new and useful Improvements in Means tary into Reciprocatniig the following is a spec c ing had to the accompanying Motion, of which ation, reference be} drawings.

This mventionerelates to improved means i for converting rotary into reciprocatingimo- Specification of Letters Patent.

Application filed June 22, 1

for Converting Ito tion, and ha-sfor its primary object topic-- vide a very si-mple'devlce which may headvantageously' employed forthe operation of engine pistons, saws, sickles, and in like instances, whereby a true rectilinear reciprocating movement may be transmitted at'i-high speed.'.'

It is another object of the invention to a device of the above character which when used in connection with a recieliminates the necessity of employing a cross head and guides therefor, so that space may be economized in the installation of the 'engines, while at the same time, the free reciprocatingmovement of the piston withoutbinding will be assured.

It is also a further general object of our invention to, materially simplify the con the efficiency of destruction and increase engines,

vices for the above purpose and thereby render the same strong and durable,'and capable of manufacture at relatively 'small cost.

With the above and other objects in view, the inventionconsists'in the improved'concombination and relative arrangement of the several parts aswill-be hereinafter more fully described, subsequently claimed and illustrated in the accompanying drawings-in which similar reference characters designate corresponding parts throughout theseveral views, and wherein Figure 1 is a side elevation, one of the side plates of the internal gear being removed; Fig. 2 is a vertical sectional view; i Fig. 3 is a view similar to Fig. 1, showing the piston rod at the end of its stroke in one direction; and Fig. 4 is a side elevation showing the device operating a reciprocating saw.

Referring in detail to the drawings, 5 designates an annular internally toothed gear. The teeth 6 of this gear terminate at one endof their ends'in spaced relation to the edge'of the gear to provide an annular track, indicated at 7, for a purpose which Wlll be later explained.

The opposite sides of the annular gear 5 are closed by means of the side plates 8, and

the side plates 8, said shaft beingprovided upon its outer end with a belt wheel or gear 11,.through the medium of which rotation f-may be transmitted to said shaft or, if de Patented Ju ta, 1919. 91s. sem1no.241 ,4oa a 4x.

screwsor bolts 9 are engaged through" spaced openlngs 1n the outer edges of these plates sired, in adapting the device to reciprocating the shaft 10 may constitute the power shaft of the engine. Upon the shaft 10 within the annular gear 5, a crank arm 12 is fixed at one of its ends. An externally toothed-gear 13 is loosely mounted upon. the other end of this crank arm and has meshing engagement with the teeth 6 of the internal gear. Upon this latter end of the crank arm at the outer side of the gearl3, an arm. 14 is loosely engaged and extends radially upon the face of the gear. The outer end of this arm 14 is fixed to the gear face by the wrist pin. 15-, in longitudinal alinement with theshaft 10. Upon this wrist pin, the, end of a piston rod 16 or other element to which reclprocatory motion is loosely engaged. This rod extends through a, stufiing box indicated at 17, which is prorim of the annular gear 5 vided upon the The gear 13 is formed with an annular flange 18 at the side thereof from which the wrist pin 15 projects, and this flange is engaged upon the annular track 7 formed upon the inner face of the gear 5. This flange greatly strengthens the, teeth of the gear 13 and afl'ords a smooth, contact or rolling face which relieves the crankarm 14 of the weight of the said gear.

In Fig. 1 of the drawings,

the device as applied to'a steam engine, and

by comparing said figure with Fig. 3 of the drawings, it will be seen that in the rotation of the shaft 10, the small ear 13 tracks around the teethof the larger internal gear,

and the Wrist pin 15 moves diametrically in to be transmitted, is

we have shown a straight line across the 'interior of the internal gear as the gear 13 travels through its circular path. Thus a true reciprocating movement is imparted to the rod 16 and the guides for the reciprocating piston will be entirely obviated, and the length of the engi ne may be materially reduced. The

.weight also is appreciably lessened so that considerable economy-may be realized in the installation of the engine.

In Fig. 4 of the drawings, we have shown ourinvention applied for the operation of a saw S. In such use, the rod 16 may be rigidly fixed to the end of the saw blade.

' It will also be apparent-that the device can likewise be advantageously used in connection with grain mowers for theoperation of the sickle. The device can likewise be applied tomany other analogous uses. The device may be driven at a very high speed without binding or derangement of its several parts and as the gear elements are entirely inclosed, grain, straw or other foreign matter cannot become entangled in the gear teeth. The small gear 13 is,

ofcourse, onehalf the ratio of the large gear 5 and such ratio is maintained regardless of the and whereby its speed is predetermined. From the foregoing description, taken in I connection With the accompanying drawings, the construction, manner of use and several advantages of the devlce Wlll be clearly and fully understood. By elimihating the use of across head and guides all friction is avoided, and the use of lubricating oil also economized. It is only necessary to place a relatively small quantity of oil withln the base portion of the large gear 5 so that in the rotation ofthe small gear 13, the gear teeth will be thoroughly lubricated, as well as the crank shaft and wrist pin connection for the reciprocating rod 16.

We have herein shown and described the preferred construction and relative arrange upon said trac fixed upon said toothed gear,

closing the 0pposite sides of the gear, a shaft rotatably supported by one of said side plates at the axial center of the gear, a crank arm fixed upon: said shaft, a relatively small gear wheel rotatably supported by the crank arm and meshing with the teeth of the internal gear and havin an annular flange engaged small gear, and a 2. A device of the character described sald gear having an annular internal track at one end of the gear teeth, side plates closing the opposite sides of the gear, a shaft rotatably supported by the side plate remote the axial center of said gear, a crank arm shaft, a relatively small gear wheel rotatably supported by the crank arm and meshing with the teeth of themternal gear and having an annular flange from the annular track of the gear, and at sizes in which the devlce may be constructed 1;

parts of the device, but

a wrist pin fixed to the rectilinearly movable re ciprocating rodconnected to said wrist in.'

engaged upon said. track, a wrist pin fixed to the'small gear, able reciprocating wrist pin. I

In testimony whereof we hereunto aflix and a rectilinearly movrod connected to said our signatures in the presence of two witnesses. I 1 v J WILLIAM B. BALDWIN. JOHN CURTIN.

Witnesses OORA BROWNE, ANGELA M. RYAN.

. 55 1. A device of the character described comprising a fixed internally said. gear having an annular track at one end of'the gear teeth, side plates 

